<template>
  <header class="header">
      <h1>任务列表</h1>
      <input class="new-todo" 
      placeholder="请输入要做的事情" 
      autofocus 
      v-model="todo"  
      @keyup.enter="add" />
    </header>
</template>

<script>
export default {
  data() {
    return {
      todo:''
    }
  },
  methods: {
    add() {
      this.$emit('add',this.todo)
      this.todo= ''  //清空输入框
    }
  }
}
</script>

<style>

</style>